Mocking with SharePoint

So while going through my blogs I came across one about a new mocking framework specifically designed for unit testing within SharePoint. The blog can be found here and from their website they have several demos of using Isolator for SharePoint mocking. I'm interested in having more of a play with it, and Typemock are offering a free license for so: Typemock are offering their new product for unit testing SharePoint called Isolator For SharePoint, for a special introduction price.